It is fine for displays without audio functionality to not implement CEA extension in their EDID. Do not return an error in that case, instead return 0 as if there was a CEA extension with no audio or speaker block.
This fixes half of bug fdo#107825: https://bugs.freedesktop.org/show_bug.cgi?id=107825
Signed-off-by: Jean Delvare jdelvare@suse.de Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard maxime.ripard@bootlin.com Cc: Sean Paul sean@poorly.run Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch --- drivers/gpu/drm/drm_edid.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- linux-5.2.orig/drivers/gpu/drm/drm_edid.c 2019-08-30 17:57:38.199990995 +0200 +++ linux-5.2/drivers/gpu/drm/drm_edid.c 2019-08-30 18:04:36.840333834 +0200 @@ -4130,7 +4130,7 @@ int drm_edid_to_sad(struct edid *edid, s cea = drm_find_cea_extension(edid); if (!cea) { DRM_DEBUG_KMS("SAD: no CEA Extension found\n"); - return -ENOENT; + return 0; }
if (cea_revision(cea) < 3) { @@ -4191,7 +4191,7 @@ int drm_edid_to_speaker_allocation(struc cea = drm_find_cea_extension(edid); if (!cea) { DRM_DEBUG_KMS("SAD: no CEA Extension found\n"); - return -ENOENT; + return 0; }
if (cea_revision(cea) < 3) {